Rename styles => css

resources/css/main.css

@@ -893,7 +893,6 @@ html, body {
   padding: 0;
   background-color: #364040;
   scroll-behavior: smooth;
-  font-family: sans-serif;
 }
 
 a {
@@ -940,18 +939,6 @@ a:active {
   padding-bottom: 0;
 }
 
-.hidden {
-  display: none;
-}
-
-.flex {
-  display: flex;
-}
-
-.inline-block {
-  display: inline-block;
-}
-
 .no-decoration {
   text-decoration: none;
   color: inherit;
@@ -1093,6 +1080,7 @@ a:active {
 }
 
 #scroll-to-top {
+  display: none;
   width: 50px;
   height: 50px;
   position: fixed;